Drill bit holder



Aug. 13, 1940. L, TRAWS y 2,211,393

DRILL BIT HOLDER Filed July 21, 19.58 s sheets-sheet 1 INVENTOR. Lemma TAv/s.

95 ATTORNEYS.

Allg. 13, 1940. TRAVIS 2,211,393

DRILL BIT HOLDER Filed July 2l, 1938 3 Sheets-Sheet 2 INVENTOR. Leo/varo 7km/.

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Aug. 13, 1940. L. TRAVIS DRILL BIT HOLDER Filed July 21, 1938 3 Sheets-Sheet 3 INI 'E YTOR.

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ATTORNEYS.

Patented Aug. 13, 1940 UNITED STATES rATENT oFFicE DRILL BIT HOLDER. Leonard Travis, Sidney, Iowa Application July 21, 1938, Serial No. 220,536

3 Claims.

This invention relates to a drill bit holder and has for an object to provide a drill bit holder which is adjustable for different sizes of drill bits, such as small, medium and large size drill bits, and is so designed that the particular drill bit may be held against a grinding wheel at the proper angle according to the size of the drill bit inaccordance with the particular work the drill bit is to be used.

Still a further object of this invention is to provide a drill bit holder which may bei made in several different forms as desired all of which forms, however, are so designed that they may be mounted on the same stand.

A still further object of this invention is to provide a stand for the drill bit holder which stand includes both horizontal and vertical ways permitting horizontal and vertical adjustment relative to the position of the grinding wheel, which stand is further provided with a graduated feed means so that both sides of the drill bit may be ground exactly alike.

With the foregoing and other objects in View, as will hereinafter become apparent, this invention comprises the combinations, constructions and arrangements oi parts hereinafter set forth, disclosed, claimed and illustrated onthe accom.- panying drawings.

In these drawings:

Fig. l is a front elevational view of one form of drill bit holder which is` adjustably mounted on the bit arm pin.

Fig. 2 is a section View on line 2 2 of Fig. 1.

Fig. 3 is a section view on line 3-3 of Fig. 1.

Fig. 4 is a fragmentary view of the drill bit holder and stand partly in section.

Fig. 5 is a` plan View of a form of holder differing from Fig. 1 in that it is not adjustable.

Fig. 6 is a sectional view on line 6 6 of Fig. 5.

Fig. 7 is an end View on the lip end of Fig. 5.

Fig. 8 is an end view on the lip end of another form of holder, having an adjustable lip.

Fig. 9 is a plan view on line 9-9 of Fig. 8.

Fig. 10 is a perspective view of still another 45 form of this invention, having an adjustable drill holding trough, partly in section, and mounted in operative position on the stand used for all forms of this invention.

Fig. 11 is a top plan fragmentary view of Fig. 10.

Fig. 12 is a Sectional View on line l2-'l2 of Fig. 11.

Fig. 13 is a plan view ony line l3-l3 of Fig. 12.

There is shown at Il! in Fig. 1 one form of the drill bit holder which may be mounted on the 55 stand il for operation for grinding a drill bit l2 (Cl. 5l-219) against a grinding wheel I3, the grinding wheel i3 being rotated by any convenient form of power electrical, manual or otherwise.

The holder lil includes a drill bit trough I4 adiustably mounted on a pin l5 which is slidably inserted in the bearing 'l2 of the stand ll.

The trough lll has an adjustable stop l 6, xable in position by means of a thumbscrew ll, against which stop I6 the end of the drill i2 may abut.

The cutting end i8 of the drill l2 rests against a lip i9 on the end of the trough iii and may be held iirmly thereagainstA by means of a clamp arm 29. This clamp arm 2i) is pivoted on a pin 2i extending through a pair of spaced abutments 22 which extend from the side of the trough I4.

Another pin 23 extending between the `same abutments 22 pivotly supports a bolt 24 which extends through a suitably placed slot in the clamp arm 2d, and holds the clamp arm 2li by means of thewing nut 25, in clamping position over the drill bit I2.

This drill holder MJ is adjustably mounted on the pin l 5 by means of a pair of spaced depending ilanges 25 and 2l, between which is tted a attened head 28 forming an integral angular eX-' tension of the pin l5, the head 2B being shaped substantially as shown with the long slot 29 and the three crosscuts 30, 3l and 32.

The slot' 29 cooperates with a thumbscrew 33 for holding the head 28 pivotly and slidably` between the flanges 2li and 2l. A second thumbscrew 34S extending through ange 2l and threaded into the ilange 26 is provided with ya thinned shank 35 which will freely fit in any one of the crosscuts 30, 3l and 32, permitting the trough lll to be slidably adjusted on the shank of the screw 33 within the slot 29 of the head 28 and bring the thumbscrew 34 into registry with the selected position in any one of the crosscuts 30, 3l and 32, according to the degree that the drill. cutting end I8 is to be ground.

In operation it is found desirable to place ythese crosscuts so that the selected angles may have 30, 59 and 65 or '70 degree positions indicated thereon, crosscut 3l! being for small drills, crosscut 3| for medium drills, and' crosscut 32 for large drills. As shown in Fig. Ll, the drill holder is set at the 59 degree position for a small drill, with the thumbscrew shank 35 at the full line position. If shank 35 be placed fully into the cross cut at the dotted position 30, the small drill would be sharpened at a 30 degree angle. Similarly, it may be placed near the edge of the crosscut at the 70 position to sharpen it at a 70 degree angle. Instead of 70 degrees, this angle may be selected by some manufacturers as 65 degrees. In the same way, medium or large drills may be adjusted in their crosscuts 3i and 32.

In grinding the drill l2 the drill holder I is placed with the pin I5 in the bearing 'I2 of the stand II. This bearing 'I2 is formed on the end of a spring leaf 36 and secured by screws 3l to enlarged foot 38 of an upright 39.

This upright 35 ends in a pointer 40 cooperating with graduations llI on a feed Wheel 132 which is threaded on a bolt i3 carrying a coiled compression spring fill between the leaf spring 36 and the back of the upright 35.

The upright 39 is secured by means of a wing nut and bolt I6 and slot @l to a leg i5 of the angle bracket 48. This angle bracket 48 is similarly adjustably secured on horizontal ways 49 of a base 5E! by means of a wing bolt and nut 5i and slot 52. The base 5E! is secured as by stud bolts 53 to the same foundation 543 on which the grinding wheel I3 is supported.

In operation the drill bit i2 is secured by the clamp arm 28 in the drill trough I4, with its cutting end I8 resting against the lip I9, the angle of the pin I5 to the trough IFI having been selected by adjusting its head in the particular crosscut desired. The stand II is then adjusted vertically and horizontally as desired to bring the bit cutting end i8 into contact with the grinding wheel i3 either at the center of the grinding wheel or above or below as desired, its being observed at the center is usually the preferable position. Then with the grinding wheel I3 in rotation the drill cutting end I8 may be moved across the grinding part of the wheel E3 by sliding the pin I5 in or out of the bearing l2 at the same time it may be moved up and down about the pin i5 and bearing 'I2 as a center. As the grinding proceeds the feed wheel 42 is rotated to keep the bit cutting end I8 in contact with the grinding surface of the wheel I3 as it is being sharpened.

After one side is sharpened the drill bit i2 is rotated degrees within the holder to bring its other face against the grinding wheel after rst observing the position the particular graduation il relative to the point of 40. The feed wheel is then backed away permitting the drill to be put in position again, Then the feed wheel 42 is gradually rotated again the exact same amount as determined by the position di thus grinding both faces of the cutting end identically.

In the form of the invention shown in Figs. 5, 6 and 7 those parts which are the saine as in the rst form of Figs. 1 4 bear the same reference gures. Instead of pin I5 of this form being adjustable relative to trough I/ it is fixed in an abutment 55 extending from the trough I4 near the end or opposite the spaced abutments 22, otherwise the construction and operation of this form of the invention is identical with that just described.

The form of the invention shown in Figs. 8 and 9 is identical with that shown in Figs. 6 and 7, except that it has an adjustable lip 59 adjustably secured thereto by a bolt and wing nut 60 extending through slot 5I in the side of the trough.

Identification marks E0 alongside the slot show the proper positioning for the bolt and wing nut 6D to thus position the lip 59 for large, medium and small sized drill.

In the form of drill bit holder shown in Fig. 12 and Fig. 13, and likewise shown in a, similar position with the stand in Fig. l0 and Fig. 11, the pin I5 forms integral angular extension ci a drill bit arm B3. This drill bit arm 63 carries a drill bit trough 64 identical with the end of the drill bit trough of each of the other inventions, having the same drill bit clamp arm 20 and spaced abutments 22. This trough 6l! is adjustably mounted along the end of the drill bit arm 63 adjacent pin I5 by means of a thumbscrew 65 extending through the trough bearing 65 into a selected depression 6l, 68 or 69 according to whether the drill bit is small, medium or large size. A back stop l0 is adjusted on the arm G3 by means of a thumbscrew I'I to hold it in proper position for the end of the drill bit i2. to abut thereagainst.

The operation and construction ol each of the forms should be apparent from the above description in the first form of the invention.

While the device has been shown and the structure has been described in detail, it is obvious that this invention is not to be considered limited to the exact form disclosed and that changes may be made therein within the scope of what is claimed without departing from the spirit of the invention.

Having thus set forth and disclosed the nature ef this invention, what is claimed is:

1. A device for holding a drill bit in the proper drilling angle while being ground, said device comprising a stand and a drill receiving and securing member journaled on said stand, said stand including a bearing member, said drill receiving and securing member including a pin journaled in said bearing member' and a drill carrying arm, said arm including an adjustable stop member against which one end of the drill may abut and a clamp member for securing the drill on said arm with its drill end projecting therebeyond, said arm including a trough and a lip on the end thereof against which lip the drill may rest, and means for adjusting the relation of the drill carrying arm to its bearing pin, said relation adjusting means comprising an adjustable mounting between said bearing pin and said trough, said adjustable mounting comprising an abutment depending from said trough and means for adjustably securing said abutment to said bearing pin, said means including an angular extension of said bearing pin extending through said abutment and thumbscrew means for securing said abutment at diiferent graduated pesitions along said bearing pin extension, said extension including a plurality of depressions therein, said thumbscrew cooperating with a selected position in any one of said depressions to x the angular relation of said trough tc said pin.

2. In a device for holding a drill bit in a selected drilling angle while being ground, a stand and a drill receiving and securing member jour-` naled on said stand, said stand comprising a base, an angular bracket having a horizontal leg and a vertical leg, means for slidably securing said horizontal leg on said base, journaling means, means for adjustably securing said joru'naling means on said vertical leg, said journaling means including a leaf spring fastened at one end to said adjustable securing means, a journal bearing at the other end of said leaf spring and graduated means for drawing said journal bearing end towards the plane of the vertical leg.

3. In a device for holding a drill bit in a selected drilling angle while being ground, a stand and a drill receiving and securing member journaled on said stand, said stand comprising a base, an

angular bracket having a horizontal leg and a Vertical leg, means for slidably securing said horizontal leg on said base, journaling means, means for adjustably securing said journaling means on said Vertical leg, said journaling means including a leaf spring fastened at one end to said adjustable securing means, a journal bearing at the other end of said leaf spring, said adjustable securing means comprising an upright 10 slidahly secured to said vertical leg, said upright having an abutment on its base, said leaf spring being mounted at one end to said upright abutment and graduated means at the other end of said leaf spring for drawing said bearing end toward said upright, said graduated means including a pointer on said upright, a bolt passing through said bearing end of said leaf spring and said upright, and a graduated Wheel 'threaded on said bolt cooperating with said pointer.

LEONARD TRAVIS. 

